Reamer.



6. G. FORESTER.

REAMER.

APPLICATION FILED APR.6. 1918.

Patented J an. 1 1 1919.

' the metal.

IJ'NIT SATES PATEN T OFFICE.

GUSTAV G. FORESTER, 0F MOLINE, ILLINOIS.

REAMER.

Application filed April c, 1918.

To all whom it may concern Be it known that I, GUSTAV G. FORESTER, acitizen of the United States, residing at Moline, in the county of RockIsland and State of Illinois, have invented certain new and usefulImprovements in Reamers, of which the following is a specification.

My invention has reference to reamers, and is more specially designedfor use in finishing the tapered openings in the center of metal hubs.As heretofore used, reamers for this purpose have been formed of aseries of sections of gradually varying diameters. In using a reamer ofthat character for trimming out the inner wall of the hub, and preparingit for the operation of a smoothing or finishing tool, irregular cuts,or steps would be formed in These irregularities would be later removedby the finishing tool, and frequently two of such tools would berequired, one to do the rough finishing work, and the (fither to providethe smooth, or finished sur- 'ace.

By the use of my invention, it is possible to produce a uniform andcontinuous cut on the inner wall of the hub, without leaving ridges orirregularities such as are caused by the reamers above mentioned. Thismakes it possible to remove a very small portion of the metal, insteadof having to trim out a considerable amount, as at present. It is nowusual to bore the opening in the hub of considerably less diameter thanis required when the same is finished, so as to allow for the materialwhich is wasted in the cutting. By the use of my invention this is notnecessary, as all of the metal that is required to be removed is thebare thickness of the scale that is formed thereon when the hub is cast.There is thereby a considerable saving of material through the use of mytool. The wall of the opening in the hub is also left in such conditionas to make only one smoothing operation necessary, thereby reducing thetime and cost of production.

In my device, I use a plurality of knives, or cutters, arranged inalternating series, and disposed in tapering relation, so as to producethe desired cut in the hub. These cutters can be sharpened, or replaced,when worn, and can be separately tempered, thus doing away with thenecessity of tempering the entire tool, as is done in those now in use.When the entire reamer is hardened,

Specification of Letters Patent.

Patented Jan. 14, 1919.

Serial No. 226,989.

the temper thereof is frequently not uniform, soft spots occurringtherein, which interfere with the efiicient operation of the tool. Thecutters above referred to, which are embodied in my invention, aresecured in place in a novel and substantial manner.

The foregoing and other features and advantages of my invention willmore fully appear in the following specification, reference being had tothe drawings accompanying the same, in which:

Figure 1 shows my invention in elevation, detached. Fig. 2 is ahorizontal section therethrough.

In machines in which inventions of this class are in use, it iscustomary to support the reamer in inverted position, so as to bevertically movable, but so as not to rotate, and the hub to be operatedon by said reamer is secured to a rotatable table or lathe, so as torevolve therewith. The reamer is thereupon moved gradually downward intothe opening in the hub, until the desired amount of cutting of the metalis accomplished. No part of the machine for operating the reamer or hubis shown in the drawings herein.

1 represents a shaft, adapted to be vertically supported from a machinein any usual manner for operation as above mentioned, upon the upper endof which shaft is a collar 2. A plurality of metal disks 3 are adaptedto be located on said shaft by means of openings 4 in the centerthereof, of suflicient diameter to permit the disks to move freely onthe shaft 1. The upper disk 5 is rigidly connected with said shaft.

The disks 3 and 5 are provided in their adjacent faces with recesses 6,adapted to receive cutters 7, preferably square in crosssection, asshown in the drawings. The recesses 6 are provided alternately inopposite faces of the disks, so as to permit of the arrangement of thecutters 7 in alternating rows, as shown in the drawings herein. For thespecial use of the tool, such as is hereinbefore mentioned, the disks 3are provided with a gradually decreasing diameter downwardly, and thecutters 7 are also formed of varying lengths, so as to provide atapering conformation therefor. Said disks are held in place by means ofan internally threaded collar 8 on the lower threaded end of theshaft 1. The width of said disks, as compared with the thickness of thecutters 7, is such that said disks are slightly spaced apart. By thismeans the tightening of the collar 8 operates to clamp the cutterstightly between the disks. also acts as a key, to prevent any of saiddisks from rotating on the shaft.

The cutters 7 are shown herein as arranged in two pairs of alternatingrows, but such arrangement can be varied to some 6X- tent, it beingnecessary to have a sufficient number of "such rows against the wall ofthe hub on at least three sides, of the tool. Said cutters are alsopreferably arranged so that the lower edges of one pair thereof will bein substantially the same horizontal plane with the upper edges of thenext alternating pair below the same.

Thelength of the reamer is greater than that of the opening to befinished, so that as the lower cutters 7 become worn, the tool: can bemoved a greater distance downwardly, bringing fresh cutters intooperation. When all of such cutters become worn, so as-to be no'longereffective, the upper cutters can be moved downwardly in the tool to apoint where a less diameter of cut is required. All of the cutters canthus be used until reduced to the length of those in the lower end ofthe tool.

The cutters 7 are provided with a sufficient degree of hardness for thework for which they are required, but the other parts of the tool neednot be tempered, but can be formed of' cast or similar metal. In caseone of the cutters is discovered to be insufficiently tempered, it canbe removed and replaced by another one. Gutters of the preferred form,as shown and described herein,.can be readily produced from bars oftempered metal now 'procurable for machine purposes.

What-I claim as my invention, and desire to secure, is:

1. A. device of the class described, comprising ashaft; a plurality of.disks of tap'ering' formation supported on said shaft; and a pluralityof cutters adapted to be Copies of thiBv patent may be. obtained forEach of said cutters to give a bearing tame? clamped between said disksin alternating rows, the conformation of the cutting edges of saidcutters coinciding with that of said disks.

2. A device of the class described, comprising a shaft; a plurality ofdisks provided in adjacent faces with coinciding recesses,-disp0sed inalternating rows; a plurality of cutters held in said recesses, thecutting edges of said cutters having a tapering conformation; and meansfor clamping said disks and cutters tightly together.

3. A device of the class described, comprising a shaft; a plurality ofspaced-apart disks provided in their adjacent faces with coincidingrecesses, disposed in alternating rows; a plurality of cutters held insaid recesses, the cutting edges of said cutters havinga taperingconformation; and means for clamping said disks and cutters tightlytogether.

4. A device of the class described, comprising a shaft; a plurality ofdisks supported on said shaft in. tapering sequence, and provided intheir inner faces with co inciding recesses, arranged inv alternatingrows; a plurality of cutters adapted to be held in said recesses, theadjacent edges of said cutters being. in approximately the same planetransversely for clamping Sflddg together.

5. A device of the class described, comprising a shaft; a plurality ofclamping members, arranged on said shaft in tapering sequence, andadapted toreceive. a plu rality of cutting members, arrangedinalternatingseries; a plurality of cuttinginembers, removably held insaid clamping members, and assisting in locking'the samefrom rotation onsaid shaft; and means carried by said shaft for holding said clampingmembers and cutting members tightly to: gether.

Intestimony whereof I affix my, signature.

GUSTAV G. FORESTER.

disks. and cutters tightly five cents each, by. addressing the.Gommi-Sfiiqner. of Patents,

Washingtqn, D. 0.!

of said shaft; and means

